<http://schema.org/thumbnailUrl>
<http://www.mercurynews.com/wp-content/uploads/2016/08/20080629_070957_California_Fires.jpg>
<http://www.mercurynews.com/2008/06/29/indoor-activities-irritated-eyes-asthma-inhalers-as-smoke-lingers-in-bay-area/>